package com.bu.web;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @author xueqiang.mi
 * @since 2011-2-27
 */
public class SecurityFilter implements Filter {

	@Override
	public void destroy() {
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
		HttpServletRequest hRequest = (HttpServletRequest) request;
		HttpSession session = hRequest.getSession();
		if (session.getAttribute("email") == null) {
			HttpServletResponse hResponse = (HttpServletResponse) response;
			hResponse.sendRedirect("/login");
			return;
		} else {
			filterChain.doFilter(request, response);
		}
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
	}
}
